Update dependency eslint-plugin-lit-a11y to v5

Author: renovate[bot]

package-lock.json

@@ -48,7 +48,7 @@
     "eslint-plugin-html": "^8.0.0",
     "eslint-plugin-import": "^2.26.0",
     "eslint-plugin-lit": "^1.15.0",
-    "eslint-plugin-lit-a11y": "^4.0.0",
+    "eslint-plugin-lit-a11y": "^5.0.0",
     "eslint-plugin-no-only-tests": "^3.1.0",
     "eslint-plugin-wc": "^3.0.0",
     "gh-pages": "^6.0.0",